Commitments and Contingencies Commitments and Contingencies - Components of Lease Commitments Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Amortization of lease right-of-use assets	$ 8,283	$ 7,874
Short-term lease expense	204	561
Non-lease components (including taxes, insurance, common maintenance, etc.)	3,004	2,927
Total operating lease expense, excluding rent	$ 11,491	$ 11,362